On my system (10.5.2) the launchd plists controlling Time Machine are a little different -- perhaps it's something Apple changed in the latest update.

To adjust the time interval of Time Machine backups, you go into the com.apple.backupd-auto plist as you write, but to change the setting to run Time Machine when a volume is mounted, there is a separate plist in System Daemons: com.apple.backupd-attach.

Drew

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I just checked the System Daemons in Lingon. The com.apple.backupd-attach has a default time of midnight checked. So I checked my Time Machine backups and have been getting two backups: one at midnight from com.apple.backupd-attach and one at 4am from com.apple.backupd-auto.

I suppose the instructions need to altered to:

1) Download and Install Lingon.
2) In the right-hand column, access the System Daemon heading and highlight com.apple.backupd-auto.
3) In the main window, skip to section three, uncheck Run it every time a volume is mounted
4) Now access the System Daemon heading and highlight com.apple.backupd-attach.
5) In the main window, skip to section three, set days and time as you wish.
6) Save and Restart OS X.

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